-
SURFACE
VEHICLE
RECOMMENDED
PRACTICE
1.
Scope
L.E.D. Signal and Marking Lighting
Devices
REV.
JUL2005
J1889
Issued
1988-06
Revised
2005-07
Superseding
J1889 JUN1999
?
This
SAE
Recommended
Practice
applies
to
functions
of
motor
vehicle
signalling
and
marking
lighting
devices
which
use
light
emitting
diodes
(L.E.D.’s)
as
light
sources.
This
report
provides
test
methods,
requirements,
and
guidelines
applicable
to
the
special
characteristics
of
L.E.D.
lighting
devices.
This
Recommended
Practice
is
in
addition
to
those
required
for
devices
designed
with
incandescent
light
sources.
This
report
is
intended
to
be
a
guide
to
standard
practice
and
is
subject
to
change
to
reflect
additional
experience and technical advances.
1.1
Rationale
The
changes are as follows;
1.
2.
3.
4.
5.
6.
7.
8.
9.
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/p>
,
,
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`
,
-
,
SAE Technical Standards Board Rules
provide
that: “This report is published
by SAE to advance the state of technical and
engineering sciences. The use of this report is
entirely
voluntary, and its
applicability and suitability for any particular
use, including any patent infringement arising
therefr
om, is the sole responsibility
of the user.”
SAE reviews each technical
report at least every five years at which time it
may be reaffirmed, revised, or cancelled. SAE
invites your written comments and suggestions.
Copyright ? 2005 SAE
International
All rights
reserved. No part of this publication may be
reproduced, stored in a retrieval system or
transmitted, in any form or by any means,
electronic, mechanical, photocopying,
recording, or otherwise, without the
prior written permission of SAE.
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PLACE A DOCUMENT
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Tel:
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(inside USA and Canada)
Tel:
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Fax:
724-776-
0790
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Copyright
SAE International
Provided by
IHS under license with SAE
No reproduction or networking permitted
without license from IHS
Not for
Resale
The foreword was removed because it
only applied to the last revision.
The name of the document
was changed to
L.E.D Signal and Marking
Lighting Devices
from
L.E.D. Devices
to reflect
the addition of a companion document SAE XJ2650
for forward lighting.
Removed SAE J576 from applicable
documents because it is no longer referenced in
the standard.
Added SAE J2139 to applicable
publications.
Changed 3.2
definition of an L.E.D. to be the same as the
definition in SAE XJ2650.
(New) L.E.D.
—
An
indivisible discrete light source unit, containing
[a] semiconductor junction[s], in
which visible light is produced when
forward current flows as a result of applied
voltage.
(Old)
L.E.D.
—
An indivisible,
discrete light source unit containing a
semiconductor junction in which
visible light is non-thermally produced
when a forward current flows as a result of
applied voltage.
Expanded 3.3 the definition of a L.E.D.
Lighting device.
Changed 3.4
the definition of an Incandescent lamp source to
correspond with the definition of a
filament bulb in
J387.
Added 3.8. A
definition for
Photometric Stability -
the point at which the photometry is
stable
±
5% within the previous 15
minute period
.
Added section
4,
Identification Codes, Markings and
Notices
, to be consistent with other
lighting J
documents. This resulted in renumbering
the rest of the document.
10.
Added or
J2139 to the paragraph with SAE J575, they are
companion documents.
J2139
was also
added
anywhere else J575 was
mentioned
.
11.
Changed 5.1.3
Dust by and added the words
on the
inside of the lens
.
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`
-
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,
,
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,
,
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,
`
,
,
`
SAE J1889
Revised JUL2005
12.
Section 5.1.5
P
HOTOMETRY
T
EST
was changed to
reference SAE J1330 photometry guidelines, which
was updated to include some of the
special considerations, needed for L.E.D.
lighting.
13.
Section
5.1.5
was
broken
up
into
two
sections
5.1.5.1
and
5.1.5.2
that
helps
to
clarify
the
testing
pro
cedure
for
the
two
different
types
of
lamps
previously
identified
as
“steady
burning”
and
“intermittent
operating”
lamp
functions.
The
new
wording
provides
clear
instructions
on
how
to
perform
the
tests
for
each
type.
Included
in
this
change
was
also
the
removal
of
the
term
heat
saturation, which was replaced with the
term photometric stability.
14.
Added
a
sentence
to
section
5.3.3.1
to
help
clarify
the
minimum
and
maximum
temperatures.
The
minimum temperature
shall be -30 °
C, and the maximum
temperature shall be 50 °
C.
15.
Section 6.1.5
was changed to correspond with the changes made in
5.1.5.
16.
Removed Section 6.4 because it is
already in all of the individual photometric
standards.
17.
Removed
Section
7.1
because
Photometric
design
guidelines
have
been
removed
from
corresponding documents.
18.
Removed
section 7.2.3 because this document is not an end
user document.
2.
2.1
References
Applicable Publications
The
following publications form a part of this
specification to the extent specified herein. The
latest issue
of SAE publications shall
apply.
2.1.1
SAE P
UBLICATIONS
Available from SAE, 400 Commonwealth
Drive, Warrendale, PA 15096-0001 or at
.
SAE
J575
—
Test Methods and
Equipment for Lighting Devices and Components for
Use on Vehicles
Less than 2032 mm in
Overall Width
SAE
J759
—
Lighting Identification
Code
SAE
J1330
—
Photometry Laboratory
Accuracy Guidelines
SAE
J2139
—
Test for Signal and
Marking Devices Used on Vehicles 2032 or More in
Overall Width
2.2
Related Publications
The
following publications are provided for
information purposes only and is not a required
part of this
specification. The latest
issue of SAE publications shall apply.
2.2.1
SAE
P
UBLICATIONS
Available from SAE, 400 Commonwealth
Drive, Warrendale, PA 15096-0001 or at
.
SAE J387
—
Terminology
—
Motor
Vehicle Lighting
SAE
J578
—
Color
Specification
Copyright SAE
International
Provided by IHS under
license with SAE
No reproduction or
networking permitted without license from
IHS
-
2
-
--`,,``,,-`-`,,`,,`,`,,`---
Not
for Resale
3.
3.1
Definitions
Semiconductor
SAE J1889
Revised JUL2005
A material
whose resistivity lies in the broad range between
conductors and insulators.
3.2
L.E.D.
An indivisible, discrete light source
unit containing [a] semiconductor junction[s] in
which visible light is
produced when
forward current flows as a result of applied
voltage.
3.3
L.E.D. Lighting Device
A
device in which light is produced by a single or
an array of L.E.D. light source
unit(s).
3.4
Incandescent Light Source
Device in which light is produced by
means of one or more filaments heated to
incandescence by the
passage of an
electric current.
3.5
L.E.D Light
Source Center
For a single L.E.D.
light source unit, the point that is located at
the geometric center of the junction where
the luminescence takes place, or the
surface from which luminescence appears to
originate.
3.6
L.E.D. Lighting Device Light Center
The
geometric
center
of
all
the
single
L.E.D.
light
source
centers
within
the
L.E.D.
array(s)
used
to
illuminate
the
device
function,
or
the
geometric
center
of
the
illuminated
area
if
the
light
output
is
produced indirectly.
3.7
Optically
Combined L.E.D. Light Source
The
definition of “Optically Combined” in
SAE J387 shall also apply to a lamp using L.E.D.
light sources
by substituting “L.E.D.”
for the term “filament” in the
definition.
3.8
Photometric Stability
The
point at which the photometry value is stable to
within ±
5% of the measured value over
the previous
15 minute
period.
4.
4.1
Lighting
Identification Code
The device shall
be marked in accordance with SAE J759. Refer to
specific device standards for
possible
additional marking requirements at the discretion
of the manufacturer.
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Cop
yright SAE International
Provided by IHS
under license with SAE
No reproduction
or networking permitted without license from
IHS
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Resale
5.
Tests
SAE J1889 Revised
JUL2005
The
following section describes individual tests which
need not be performed in any particular sequence.
Testing may be expedited by performing
two or more tests simultaneously on separate
samples.
5.1
SAE J575 or
J2139 is a part of this document. Unless otherwise
specified, the following tests are
applicable with modifications as
indicated.
V
IBRATION
T
EST
5.1.1
The evaluation of the sample at the
completion of the test shall also include a
functional lighting check. If
a partial outage is observed, a
photometry test (see 5.1.5) shall be performed and
the results recorded.
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-
5.1.2
M
OISTURE
T
EST
D
UST
T
EST
`,,`,,`,`,,`-`
---
5.1.3
If
dust is found on the inside of the lens, the
change in the maximum photometric intensity of the
sample
shall be determined by using the
photometric procedures in 5.1.5.
5.1.4
C
ORROSION
T
EST
P
HOTOMETRY
T
EST
5.1.5
All photometry tests should
be performed in accordance with SAE J1330. Because
the photometric output
(luminous
intensity) of a L.E.D. lighting device typically
decreases as the temperature of the L.E.D. light
source increases, the following
stabilization and measurement methods are
required.
5.1.5.1
Steady-Burning Lamp Functions (such as
tail lamps and side marker lamps)
Energize
the
applicable
test
device
function
and
record
the
H-V
photometric
value
after
1
minute.
Continue to energize
the test device for 30 minutes or photometric
stability which ever occurs first. Record
the photometric values at
all the required test points, including
maximums. Calculate the ratio between
the 1 minute H-V reading and the 30
minute (or photometric stability) H-V reading and
apply It to all of the
required test
points, including maximums.
5.1.5.2
Intermittent Operating Lamp Functions
(such as stop lamps and turn signal lamps)
Energize the
applicable test device function and record the H-V
photometric value after 1 minute and then
again
after
10
minutes.
Continue
to
energize
the
test
device
for
30
minutes
or
photometric
stability,
whichever occurs first. Record the
photometric values at all the required test
points, including maximums.
Calculate
the ratio between the 10 minute H-V reading and
the 30 minute HV reading and apply it to all of
the test points. Calculate the ratio
between the 1 minute H-V reading and the 30 minute
(or photometric
stability) H-V reading
and apply it to the test points.
Copyright SAE
International
Provided by IHS under
license with SAE
No reproduction or
networking permitted without license from
IHS
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4
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Not for
Resale